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Discontinued Operations - Financial Information about Discontinued Operations (Details) - Discontinued Operations - Opel/Vauxhall Business - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss from discontinued operations	$ 0	$ 0	$ 70
Net sales and revenue	144	1,129	1,939
Purchases and expenses	392	825	1,422
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash payments	630	975	1,849
Cash receipts	$ 252	$ 1,408	$ 2,310

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